OSPF Cisco IOS
From Teknologisk videncenter
Contents
OSPF notes
LSA Types
| Type | ABR | Meaning |
|---|---|---|
| 1 | O | Router Link: Indeholder alle Routerens Links. Floodes til Area |
| 2 | O | Network Link: Floodes fra DR til Area. Indeholder alle Naboer på MA-medie |
| 3 | O IA | Summary Link: Sendes fra Area til Area gennem ABR. Indeholder IA Summaries. |
| 4 | O IA | ASBR summary Link: Sendes fra ASBR’s. Indeholder externe router. |
| 5 | O E1/2 | Externe Router fra ASBR. E1 intern + extern cost. E2 kun extern cost. |
| 7 | O E1/2 | Externe Routes fra ASBR i NSSA |
Single Area configuration
Example 1
hostname R1
!
interface fastethernet 0/0
ip address 192.168.0.1 255.255.255.0
!
interface fastethernet 0/1
ip address 10.0.1.1 255.255.255.0
!
router ospf 88
network 192.168.0.0 0.0.0.255 area 0
network 10.0.1.0 0.0.0.255 area 0
|
hostname R2
!
interface fastethernet 0/0
ip address 192.168.0.2 255.255.255.0
!
interface fastethernet 0/1
ip address 10.0.2.1 255.255.255.0
!
router ospf 77
network 192.168.0.0 0.0.0.255 area 0
network 10.0.2.0 0.0.0.255 area 0
|
hostname R3
!
interface fastethernet 0/0
ip address 192.168.0.3 255.255.255.0
!
interface fastethernet 0/1
ip address 10.0.3.1 255.255.255.0
!
interface serial 0/0
ip address 172.16.0.1 255.255.255.252
!
router ospf 66
network 192.168.0.0 0.0.0.255 area 0
network 10.0.3.0 0.0.0.255 area 0
network 172.16.0.0 0.0.0.3 area 0
|
hostname R4
!
interface fastethernet 0/1
ip address 10.0.4.1 255.255.255.0
!
interface serial 0/0
ip address 172.16.0.2 255.255.255.252
router ospf 66
network 172.16.0.0 0.0.0.3 area 0
network 10.0.4.0 0.0.0.255 area 0
|
== Default administrative Distance
Cisco implementation
| Route Source | Distance |
|---|---|
| Connected Interface | 0 |
| Static Route out an Interface | 0 |
| Static Route to a next hop | 1 |
| EIGRP summary route | 5 |
| External BGP | 20 |
| Internal EIGRP | 90 |
| IGRP | 100 |
| OSPF | 110 |
| IS-IS | 115 |
| RIP (Version 1 og 2) | 120 |
| EGP | 140 |
| ODR (On Denmand Routing) | 160 |
| External EIGRP | 170 |
| Internal BGP | 200 |
| Ukendt source | 255 |